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Discussion on Modeling Capability for Macrosegregation

机译：宏观分离建模能力的探讨

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摘要

Macrosegregation originates from the solute partitioning at the liquid-solid interface and the relative motion between liquid and solid phases during solidification of metal alloys. A suitable macrosegregation model should incorporate solidification thermodynamics, crystal growth kinetics, multiphase computational fluid dynamics, and even thermal-structural mechanics. No current model includes all those phenomena, hence leading to assumptions having to be made. This paper discusses some modeling assumptions regarding the treatment of (1) diffusion kinetics of crystal growth, (2) crystal dendritic morphology and (3) solidification shrinkage. Theoretical analyses based on test calculations were made. We find that some previous models, which oversimplified some of the aspects mentioned above for the purpose of computational efficiency, can only be applied to study macrosegregation qualitatively. They lead to significant error estimations of macrosegregation. When the quantitative accuracy for macrosegregation is of primary importance, the multiphase-based models with an appropriate treatment of these aspects, despite the sophisticated computational requirements, are recommended.
机译：宏观偏析起因于固液界面处的溶质分配以及金属合金凝固过程中液相和固相之间的相对运动。合适的宏观偏析模型应包含凝固热力学，晶体生长动力学，多相计算流体力学，甚至热结构力学。当前的模型没有包含所有这些现象，因此需要进行假设。本文讨论有关以下方面的一些建模假设：（1）晶体生长的扩散动力学，（2）晶体树枝状形态和（3）凝固收缩。进行了基于测试计算的理论分析。我们发现，一些先前的模型为了简化计算效率而将上述某些方面简化了，只能用于定性研究宏观偏析。它们导致对宏分离的重大错误估计。当宏观分离的定量精度至关重要时，尽管计算要求很高，仍建议对这些方面进行适当处理的基于多相的模型。

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  • 来源
    《High temperature materials and processes》 |2017年第5期|531-539|共9页
  • 作者

    Menghuai Wu; Abdellah Kharicha; Andreas Ludwig;

  • 作者单位

    Christian Doppler Laboratory for Advanced Process Simulation of Solidification and Melting, Montanuniversitaet Leoben, A-8700 Leoben, Austria, Department of Metallurgy, Montanuniversitaet Leoben, A-8700 Leoben, Austria;

    Christian Doppler Laboratory for Advanced Process Simulation of Solidification and Melting, Montanuniversitaet Leoben, A-8700 Leoben, Austria, Department of Metallurgy, Montanuniversitaet Leoben, A-8700 Leoben, Austria;

    Department of Metallurgy, Montanuniversitaet Leoben, A-8700 Leoben, Austria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    macrosegregation; solidification; crystal growth; heat and mass transfer; porosity; diffusion kinetics;

    机译：宏观隔离凝固;晶体生长传热传质;孔隙率扩散动力学;

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